MZThe file signature of an {MS-DOS} executable (.{EXE}) file (0x4d 5a), always the first two {bytes} of the file. It was reportedly invented by, and named after, a {Microsoft} programmer, Mark Zbikowski. In {Unix} systems, the string MZ is the {magic number} that identifies an MS-DOS EXE file. (2003-06-10) mz The {country code} for Mozambique. (1999-01-27)